Hi all, There's been some previous discussion recently on differences between VL and VLT external (high pressure) fuel pumps a few years ago I tested those from a VL and a VLT and found no difference, others suggest there is a flow or other difference. I spoke to two departments of Bosch directly today and two of their distributors in Sydney and Perth and this is the data direct from the source regarding the VL/VLT external high pressure fuel pumps. There are 5 (five) different high pressure fuel pumps which are interchangeable on the VL and VLT models and all have exactly the same performance specifications which are:- Minimum flow rate: 25 Litres/Hour, Maximum fow rate: 130 Litres/Hour Continuous rated operating pressure: 300KPa In short, there is *no* difference between any of the external high pressure fuel pumps on the VL and VLT 6 cylinder models. The five different fuel pumps are these with associated comments Part Number_______Comments 0 580 464 050_____Early pump common on VL models and sometimes used on VLT models, has been superseded 0 580 464 033_____Early pump common on VLT models and sometimes used on later VL models, has been superseded 0 580 464 051_____Replacement for the 0 580 464 050 0 580 464 008_____Replacement for the 0 580 464 033 0 580 464 070_____Replacement for all of the above 4 items, part of Bosch's partnumber rationalisation, ________________new (recommended) substitute for VL & VLT, this has screw terminals instead of spades ! I'm advised by Bosch that the last 3 digits of the part numbers had several relational issues to do with internal amendments to pump specifications, for the most part these were minor and had to do with the electric motor, type of permanent magnets, brush sets, ball types, clearances, terminal corrosion plating resistance and other minor amendments. I asked specifically if the part numbers had anything to do with origin of manufacture and the reply is no, that would have complicated the release of OEM specifications. Bosch have however rationalised the manfuacture of these parts to reduce the large spread of pumps that Bosch used to make. So the short report is all external tank high pressure fuel pumps for the EFI VL and VLT used pumps which are confirmed by Bosch as having identical performance specifications.

apparently the electric fuel pumps off the camiras also fit and are the same as VL and VLT pumps i was told by a wrecker Some original photos have not been recovered yet.

Good work Mike - about time someone dispelled the myths and urban legends about the VL fuel pumps Some original photos have not been recovered yet.

Quote: Originally Posted by GoldenBoy apparently the electric fuel pumps off the camiras also fit and are the same as VL and VLT pumps i was told by a wrecker Ah ha - interesting point, because I had a partnumber somewhere for what I was told came off a camira (cant find it at mo) and it was identical in shape/size/terminals to the VL/VLT but was only spec'd to operate at 250KPa, so its possible that one might work on a VL but would definitely be marginal on a VLT. Of course its possible Holden were short of parts during the models manufacture and borrowed some from the VL range, so if the part numbers match then the spec's I posted confirm it. Who knows for sure though, thing is Bosch (being a German co) are quite rigorous with their specifications and are generally over-rated - I hear rumour for example that the Bosch alternator on the VL can supply 100Amps with relatively minor modifications but I havent confirmed that. It would be of interest to get some part numbers off pumps designated as being for the Camira... Some original photos have not been recovered yet.

You have certainly done your research mike, i would like to know more about this alternator idea if you know more. PM me!

Quote: Originally Posted by JET-6 You have certainly done your research mike, i would like to know more about this alternator idea if you know more. PM me! All I know is someone did a relatively minor mod to a Bosch alternator to change the winding and/or the regulator to get more current - I'm not sure if he changed the diodes, but stated quite firmly he got at least 85 Amps and short pulls of 100Amps, its been sometime since I spoke to him, hes not in Perth anymore, and I have way too much work on to track him down - but I guess it has to do with the windings connections and might reduce output at low revs - didnt have to do with changing pulleys though as that was a question foremost in my mind at the time... If something crops up I'll post an article,

Thanks, sounds good.

Thankyou! I was convinced they were [/quote] Some original photos have not been recovered yet.

Old topic but needs to be bumped for the boys that still think VLT and NA pumps are different...

good work henry you must have been bored to find this one or did you actually use the search function to find this (cause that would be a first - for someone to use the search instead of posting another waste of time thread)

Thanks Mike, Its about bloody time someone with the "extra" knowledge put this to rest... I was sick of explaining to customers over the counter that at the end of the day it was the same!

Just wanna bump this back upto the top!

Has anyone researched or does anyone know the flow rate of the standard vl lift pump?